Exploring Secondary Metabolites in Coffee and Tea Food Wastes

Urban Farm DB summary

A laboratory study measured caffeine content and phenolic profiles across three types of tea and coffee waste through two successive solvent extractions. The first extraction was far more efficient overall, though green tea retained high flavanol content and mate tea high phenolic-acid content in the second extraction, black tea had the highest caffeine content across both extractions, and water proved the most effective solvent in nearly all cases — a simple, accessible extraction method the authors note is relevant to urban horticulture as a potential alternative to conventional pesticides.